A big stack two to my right had been raising on me from the button. I figured he was doing it fairly wide so I defended all-in with A7o. This time he had a hand: AQs. I'm only 25% to win against his hand, and around 48% against his range, but I nailed a 7 on the river...
...except it was the 7c which completed his ace-high flush.
Down in flames.
I had two moves there, folding or shoving. Calling was definitely out. I had about 20BB left, so it was clearly too early to make this move, because I'm essentially coin-flipping against someone who has me covered. If he's raising wide, there's a chance he's calling wide. Too aggressive, too early.