at first (adverb) originally: initially
Sinonime: acknowledge, act in response,
answer, answer back, be in touch with,
behave, come back, come back at, come in,
counter,
feedback, feel for, field the question, get back to, get in touch,
react,
reciprocate, rejoin,
reply,
retort,
return, talk back
Antonime: ask,
question,
request