to start (to initiate a vehicle or machine)

starting; activation

(engineering) an engine, a mechanical device

engine stall (abbr. エンスト)

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

set of problems

problem; point at issue

text that makes up a question/problem

matter of life or death / (idiomatic) an extremely urgent matter

viewing as a problem