The hold time is the minimum amount of time the data signal should be held steady after the clock event so that the data is reliably sampled by the clock. This applies to synchronous circuits such as the flip-flop.
Example Usage of Hold
EuniqueJG: RT @Hyperspecialbd: We cannot Hold a torch to light another's path without brightening our own
drbeerchuck: Lazy Sunday has been put on Hold to do a quote for an indoor pizza oven.