言い訳を

an excuse

→ 言い訳
phrase Uncommon #11,958
an excuse 言い訳 means “excuse” or “justification,” and を marks it as the object of the verb. The を is often omitted when listing the term in its dictionary form.
JA: 遅刻の言い訳を考えています。
EN: I'm thinking of an excuse for being late.

早く言い訳を考えないまずい事になる

I need to come up with an excuse quickly, or things will get bad.

彼は言い訳を考え出すのがうまい

He's good at coming up with excuses.

彼がどんな言い訳をするかあらかじめ分かってしまう

You can tell in advance what excuse he'll make.

言い訳をしても無駄だ

There's no point in making excuses.

そのような言い訳をしても無駄だ

Making excuses like that is pointless.

彼は遅れたことでいろいろ言い訳をした

He made all sorts of excuses for being late.

おそくまで外出していた言い訳をする

I make excuses for staying out late.

彼はすぐ言い訳をする

He always makes excuses.

彼女は遅刻言い訳をした

She made an excuse for being late.

彼は欠席言い訳をした

He made an excuse for his absence.

彼女は遅れてきた言い訳をした

She made an excuse for being late.

そのパーティーに出られない言い訳をした

I made an excuse for not being able to attend the party.

どんな言い訳をしようとを許すことはできない

No matter what excuse he makes, I can't forgive him.

言い訳をするな

Don't make excuses.

— 動くな、死ね、甦れ! (1990)

下手な言い訳をするな

Don't make lame excuses.

彼は遅刻言い訳をした

He made an excuse for being late.