Lexical Definition

‎אָטַם‎ ʼâṭam (aw-tam') to shutter ^H:V
a primitive root

narrow, shut, stop.

• to close (the lips or ears)
• by analology to contract (a window by bevelled jambs)

1) to shut, shut up, close
1a) (Qal) to shut, stop (of lips)
1b) (Hiphil) of the wicked stopping their ears (fig.)

See Greek: κρυπτός · φράσσω

Brown-Driver-Briggs

[‎אטם‎] verb shut, shut up (Mishna ‎אטם‎, compare ‎אוֺטֶם‎ stoppage, Aramaic ‎אֲטַם‎; Arabic contract, stop, fortress; Assyrian a‰amu, in list of headgear, etc. = turban? Dl^{W, No. 155}) —

Qal Participle active ‎אֹטֵם‎ Prov 17:28 + 2 t.; passive ‎אֲטֻמִים‎ 1Kgs 6:4 ‎אֲטֻמוֺת‎ Ezek 40:16 + 2 t.; — shut, stop, object lips Prov 17:28 ears Prov 21:13; Isa 33:15 passive = closed (i.e. narrowed, narrowing, compare ᵑ6 in Co) ‎׳‎‎חַלּוֺנוֺת א‎ Ezek 40:16; Ezek 41:16; Ezek 41:26 compare ‎חַלּוֺנֵי שְׁקֻפִים אֲטֻמִים‎ 1Kgs 6:4. Hiph`il Imperfect id quod Qal ‎יַאְטֵם‎ Ps 58:5* (jussive with sense of indicative, compare Dr^{§ 173 obs}.) of adder, stopping ears, simile of wicked.

Brown-Driver-Briggs References