To skip or avoid duties such as school or work; colloquial for playing truant, slacking off, or cutting class.
昨日、授業をサボってしまった。
I skipped class yesterday.
彼は会議をサボる癖がある。
He has a habit of skipping meetings.
テスト勉強をサボるとあとで困るよ。
If you slack off studying for the test, you'll be in trouble later.