1. to add, to add up, to sum up, to append, to annex
2. to increase, to gather (e.g. speed), to pick up
3. to include, to count in, to let join
4. to inflict (damage), to deal, to give
1. development, growth, expansion, extension, flourishing
2. development (of a situation, story, etc.), advancement, progression, unfolding
3. playing around (sexually; esp. of a male homosexual), having an active sex life