1. (v. t.) To take the stopple or stopper from; as, to unstop a bottle or a cask.

2. (v. t.) To free from any obstruction; to open.

bare clear deobstruct disclose expose free manifest ope patefy reveal unblock uncase unclench unclog unclutch uncork uncover uncurtain undo undrape unfold unfoul unlatch unlock unplug unroll unseal unsheathe unshut unveil unwrap