Semitic Etymological Database
The traditional identification with *ˁmḳ 'to be deep' is semantically far from evident (the application of modern concepts like “deep knowledge” has good chances of being anachronistic).
may be related to PC *ˀmṣ ‘to be strong’ (Kogan 2015: 281)
Cf. Ugaritic ˁmḳ ‘tough, strong’