(also in plural) An item of clothing which one steps into to put on; specifically, women's panties.

plural of tenant-in-chief

(idiomatic, conjunctive) In the sense of. / Used other than figuratively or idiomatically: see as, in.

In the illumination from (a source of light). / (figuratively, chiefly UK and Canada) Based on conclusions derived from (a source of knowledge, evidence or inspiration).

(idiomatic) In the middle of (something difficult).

Engaged in business activity / (idiomatic) Ready to proceed in a desired activity.

Under consideration, under discussion. / In doubt, under dispute.

Sharing one's bed with. / (figuratively) Engaging in a close mutually beneficial relationship, especially secretly and illicitly.

To prepare for the end of, or a radical change in, one's life.

So that; used to indicate purpose