to abide by
to follow the law, rules or a decision: We’ll have to change our business model in order to abide by the new regulations.
to account for
to explain or justify: The warm weather accounted for the fall in sales of winter clothing.
to act up
to malfunction: My computer’s acting up today – I can’t access the internet.
to behave badly: Sorry I’m late – my 3-year-old was acting up and I couldn’t get him dressed.
to act upon
to take action as a result of something: We must act upon the evidence, despite our reservations.
to answer for
to be responsible for a problem: The old IT manager has a lot to answer for. No wonder he was fired!
to speak on behalf of someone: Due to my client’s absence, I will answer for him.
to ask around
to ask lots of people for information or help: I need to find a graphic designer. Could you ask around and see if anyone can recommend one?