To rile someone is to annoy or bother them. For example, a friend might rile you by constantly texting when you're trying to have a conversation with her. You can also rile water, meaning you make it muddy by stirring it up.

The verb rile is derived from roil, and they basically mean the same thing. However, rile is more commonly used to mean "annoy" and roil mostly describes stirred liquid. If you rile up your sister, what you say makes gets her worked up, ready to argue with you. When a kid splashes around in the tub, the water is roiled — but if it gets all over the floor, his parents will be riled.

Definitions of rile

v cause annoyance in; disturb, especially by minor irritations

annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, vex
feel extreme irritation or anger
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get, get under one's skin
eat into, fret, grate, rankle
gnaw into; make resentful or angry
cause to be annoyed, irritated, or resentful
trouble or vex
cause annoyance in
beset, chevvy, chevy, chivvy, chivy, harass, harry, hassle, molest, plague, provoke
annoy continually or chronically
antagonise, antagonize
provoke the hostility of
goad, needle
goad or provoke,as by constant criticism
bedevil, crucify, dun, frustrate, rag, torment
treat cruelly
harass by imposing humiliating or painful tasks, as in military institutions
Type of:
give displeasure to

v make turbid by stirring up the sediments of

muddle, puddle
make into a puddle
Type of:
agitate, commove, disturb, raise up, shake up, stir up, vex
change the arrangement or position of

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