Lexical Definition

‎מָתַח‎ mâthach (maw-thakh') to spread H:V
a primitive root

spread out.

1) (Qal) to spread out

Usage: 1 form in 1 verse
Form Translated As     In Verse(s)
וַיִּמְתָּחֵ֥ם and he spread out them Isa.40.22

Brown-Driver-Briggs

[‎מָתַח‎] verb spread out (Late Hebrew id.; Aramaic , ‎מְתַח‎; Arabic be long, long (probably load-word); compare perhaps Assyrian matâ—u, direct the eyes toward); — only Qal Imperfect 3 masculine singular suffix ‎וַיִּמְתָּחֵם‎ Isa 40:22 and he (‎׳‎‎י‎) hath spread them (the heavens) out as a tent to dwell in.

Brown-Driver-Briggs References

Book Refs
Isaiah 40:22