In heterocyclic nomenclature, the infix -a- denotes replacement of a carbon atom, especially indicating that a carbon in the ring has been substituted by a heteroatom.

Calling her out in front of everyone was no way to treat a lady, and he apologized afterward.

Please have a seat while I fetch your documents.

At the mayoral rally, organizers secretly brought in a rent-a-crowd to make the turnout look impressive.

Facing a mountain of obstacles, he kept repeating where there is a will, refusing to give up until he succeeded.

She saves every spare coin in a jar, convinced that many a mickle makes a muckle.

Before committing to a full subscription, Maria decided to dip a toe into the streaming service with a one-month trial.

When I mentioned his ex, I didn't mean to touch a raw nerve, but his reaction was immediate.

When she mentioned his childhood, it hit a raw nerve and he abruptly left the room.

Every time he drinks that much, he pisses like a racehorse.