〜にかこつけて
under the pretext of, using … as an excuse
Noun + にかこつけて
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にかこつけて means using something as a convenient excuse to do what you really wanted to: 仕事にかこつけて、海外旅行を楽しんだ, "he used work as an excuse to enjoy a trip abroad".
The noun is a legitimate-sounding reason (work, illness, a birthday, a business trip, the rain), and the second half is the real motive. The tone is knowing or disapproving, even when you say it about yourself.
Compare を理由に, "for the reason of", which is neutral and can be genuine. にかこつけて always implies the reason is a pretext.
Don't confuse it with にかまけて (N1), "too wrapped up in", or にかけて (N2), "through (a period)".
Examples
仕事にかこつけて、海外旅行を楽しんだ。
He used work as an excuse to enjoy a trip abroad.
病気にかこつけて、会議を休んだ。
She used illness as an excuse to skip the meeting.
息子の誕生日にかこつけて、自分の欲しい物を買った。
I used my son's birthday as an excuse to buy something I wanted.
出張にかこつけて、昔の友人に会いに行った。
I used a business trip as a pretext to go and see an old friend.
雨にかこつけて、練習をさぼった。
He used the rain as an excuse to skip practice.