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Phono-semantic compound (形聲/形声, OC *lɯw) : phonetic 十(OC *ɡjub) + semantic 口(“mouth”) – a container with on top the pictogram of a needle (十, today 針), to indicate the ancient pronunciation. Compare the bottom part of the original version of 缶, an earthenware pot. In oracle bones, 由 was used as the original version of 怞 (yóu or, in the less conservative pronunciation, chóu). See also 俞.
Otherwise, according to Tang Lan (唐蘭), it's the pictogram of a helmet. If a helmet, may have been the same as or original character of 冑. However, this alternative interpretation is less likely.
Etymology 1
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “Related to 遊?”)