(often + for) to remain where one is or delay action in readiness or expectation
to serve at meals; to act as a waiter
Brit to park a vehicle for a short period at the edge of a road
to stay in place in expectation of (something)
Wait your turn
to delay serving (a meal) while waiting for somebody to arrive
chiefly NAmer to serve as waiter for (a table)
wait on/upon
to act as an attendant to (somebody)
chiefly NAmer to wait for (somebody or something)
We were waiting on his answer
archaic to make a formal call on (somebody)
[Middle English waiten to watch, watch for, lie in wait for, from Old Northern French waitier to watch, of Germanic origin]