a subst. from اِحْتِبَاسٌ [signifying A state of confinement, restriction, limitation, &c.]: you say, الصَّمْتُ حُبْسَةٌ [Speechlessness is a state of restriction]. (S, TA.)
2.
[Hence,] A difficulty of utterance which prevents one's speaking distinctly; (A;) a difficulty of speech, (Mbr, K,) and hesitation, (Mbr, TA,) when one desires to speak; (Mbr, K;) a hesitation in speech. (Msb.)