Tack :  (noun)
1: the heading or position of a vessel relative to the trim of its sails
2: a short nail with a sharp point and a large head
3: gear for a horse [syn: stable gear, saddlery]
4: (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind [syn: sheet, mainsheet, weather sheet, shroud]
5: (nautical) the act of changing tack [syn: tacking]
6: sailing a zigzag course ... ( more )

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MO, aberrancy, aberration, about ship, affix, algorithm, alter, alteration, ameliorate, annex, append, approach, articulate, attach, attack, azimuth, back and fill, back band, backstrap, baste, batten, batten down, be changed, be converted into, be renewed, bear away, bear off, bear to starboard, bearing, bearing rein, beat, beat about, bellyband, bend, bias, bind, bit, blinders, blinds, bolt, bottom out, box off, branch off, branching off, braze, break, breeching, bridle, bring about, bring round, buckle, butt, button, cant, cant round, caparison, cast, cast about, cavesson, cement, change, change course, change the bearing, change the heading, checker, checkrein, cheekpiece, chinband, chop, chop and change, cinch, circuitousness, clasp, cleat, clip, collar, combine, come about, come around, come round, compass bearing, compass direction, cordage, cording, corner, couple, course, crook, crownband, crupper, curb, curve, declination, deflection, degenerate, depart from, departure, deteriorate, detour, deviance, deviancy, deviate, deviation, deviousness, digress, digression, direction, discursion, divagate, divagation, divaricate, divarication, diverge, divergence, diversify, diversion, dogleg, double, double a point, dovetail, drift, drifting, equipage, equipment, errantry, excursion, excursus, exorbitation, fashion, fasten, fastening, fetch about, fittings, fix, flop, form, gag swivel, gear, girth, glue, go about, guise, gybe, hackamore, hairpin, halter, hames, hametugs, harness, hasp, haul around, headgear, heading, headstall, heave round, heel, hinge, hip straps, hitch, hook, improve, indirection, jam, jaquima, jerk line, jibe, jibe all standing, join, joint, kit, latch, lee side, line, line of action, lines, lock, magnetic bearing, manner, manner of working, martingale, means, meliorate, method, methodology, miss stays, miter, mitigate, mode, mode of operation, mode of procedure, modulate, modus operandi, mortise, mutate, nail, noseband, obliquity, order, outfit, paste, path, peg, pererration, pin, ply, pole strap, practice, procedure, proceeding, process, put about, put back, rabbet, rambling, reins, relative bearing, revive, ribbons, rig, rigging, rivet, ropework, roping, round a point, routine, saddle, saddlery, scarf, screw, secure, sew, shaft tug, sheer, shift, shifting, shifting course, shifting path, side check, skew, skewer, slant, slew, snaffle, snap, solder, staple, stick, stitch, straying, style, surcingle, sweep, swerve, swerving, swing round, swing the stern, swinging, system, tack on, tackle, tag on, take a turn, tangent, technique, the drill, the how, the way of, throw about, thumbtack, tie, toggle, tone, trappings, trend, true bearing, tug, turn, turn aside, turn back, turn into, turn the corner, turning, twist, undergo a change, unite, variation, vary, vector, veer, veer off, wandering, warp, way, wear, wear ship, weather side, wedge, weld, wind, winker braces, wise, worsen, yaw, yoke, zigzag, zipper,