To submit to an active (mostly dangerous) substance like an allergen, ozone, nicotine, solvent, or to any other stress, in order to test the reaction, resistance, etc.
To make available to other parts of a program, or to other programs.
To abandon, especially an unwanted baby in the wilderness.
To reveal, uncover, make visible, bring to light, introduce (to).
To subject photographic film to light thereby recording an image.
The chorus or burden of a song repeated at the end of each verse or stanza.
A much repeated comment, complaint, or saying.
To stop oneself from some action or interference; to abstain.
To abstain from (food or drink).