One phrase, 2 meanings. Learn them one at a time, then test yourself.
Meaning 1 · most common
To quickly put on clothes or begin using a particular way of speaking or behaving.
Example
A: Why are you speaking so formally?
B: I slip into that style when I'm nervous.
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Meaning 2
To slip into a harmful habit means to begin doing it gradually, often without intending to.
Example
A: How did you end up with so much debt?
B: I slipped into overspending after I started using several shopping apps.
Tell it apart
Pick a meaning and say it out loud. Save the ones you mix up.