This is the 12170th most frequent Korean word.
늘리자
"늘리자" means "Let's increase" or "Let's expand."
In this sentence, '늘리자' is used to suggest increasing the speed (작업 속도), serving as a proactive proposal.
우리는 생산성을 높이기 위해 작업 속도를 늘리자.
Let's increase the pace of work to improve productivity.
Here, '늘리자' is indirectly referenced in '늘리자고', meaning 'Let’s increase' in a form suggesting this to others as an idea.
예산이 부족해서 광고를 늘리자고 제안했어요.
I suggested increasing advertisements because the budget was lacking.
In this case, '늘리자면' is formed with '늘리자' and the conditional suffix '면', meaning 'If we aim to increase,' thus indicating a condition.