(informal) on a whim, rashly, on the spur of the moment

(soccer) goal kick

to fight, to fistfight

cheap shot (cowardly shot directed at someone who was once stronger than oneself but is now too weak to defend themselves, and whose weakness one takes advantage of to exact some sort of revenge)

(informal) kick in the pants, kick up the backside (forceful reminder to start or get going)

(vulgar) kick up the arse, kick in the butt (forceful reminder to start or get going)

to participate in war operations, to fight in a war

(informal) to take a hit, to take a knock (to suffer a setback)

(informal) to have had one too many, to be the worse for drink, to be tipsy

(figuratively) to stir up a hornets' nest, to stir things up