To remain committed to a decision, plan, or rule; or to physically adhere to a surface.
Don't change from what you decided, planned, or promised.
4 meanings, ordered from most common to least. Color-coded by CEFR level.
To continue with a plan, decision, or commitment without changing or giving up.
"If you want to lose weight, you need to stick to the diet for at least three months."
Stick to the plan.
— Breaking Bad, Season 3 (widely cited line; spoken by Walter White)
To remain on a subject and not digress or go off-topic.
"Please stick to the topic — we can discuss other issues after the meeting."
To physically cling or adhere to a surface.
"The wet leaves stuck to the windscreen and blocked the driver's view."
To limit oneself to a particular thing, avoiding other options.
"He doesn't drink spirits — he sticks to beer."
To be physically attached to and stay on a surface.
Don't change from what you decided, planned, or promised.
Extremely versatile and common. 'Stick to the point/script/plan' are standard collocations. The physical sense (glue sticking) is transparent. 'Stick to your guns' is a fixed idiom meaning to maintain your position under pressure.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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