behalten

to keep, to retain (money, items, etc. in one's possession)

to keep .mw-parser-output .object-usage-tag{font-style:italic}.mw-parser-output .deprecated{color:var(--wikt-palette-grey-lime-8,olivedrab)}[with accusative ‘information, etc.’ and für (+ accusative reflexive pronoun) ‘to oneself’], to not reveal (a secret)

"Ich behalte es für mich."

to remember