Definition: lie down (on a bed, floor, etc.)
Both of the passive and dominant palms face upward. These handshapes are familiar as classifiers but they are not. It's a verb in its whole sign.
Gloss: fs-LAY(ix1)/\ | fs-LIE(ix2)/\ IX1 | IX2, BOTH VERB, PRESENT TIME conj-UNDERSTAND+ TWO-THEY DIFFERENT IX1 MEAN SOMETHING to-PUT (or) PUT-ON-SURFACE SOMETHING | IX2 LIE-DOWN REST, LYING.
English equivalent: Lay and lie are both present-tense verbs, but they don't mean quite the same thing. Lay means to put or set something down. Lie, on the other hand, is defined as, "to rest in a horizontal position."
Use contrastive structure. Use fingerspelling for the English words "lay" and "lie" to explain the meaning and the difference between these two English words.