bend, stoop, crouch, to yield
詘 centers on physical lowering or yielding: bending the body, stooping, crouching, or giving way under pressure.
詘 combines 言 (speech) with 出 (go out). The historical development is uncertain, but it may relate to speech that yields or bends under pressure.
Words (言) that come out (出) bent or stooped: imagine someone speaking while bowing low, their words yielding under pressure.
For クツ, picture someone crouching into a small hut (小屋, こや) to yield space: the 'kut' sound in 'hut' cues クツ, and the crouching fits the meaning.