in one's back pocket

Meaning: (idiomatic)Readyifneeded,in reserve,prepared,availableforusewheneveritmightbeadvantageous.Synonym:in one's hip pocket2008July 16, David Friend, “New owner to spruce up Bay”, inThe Star‎[1], Toronto, Canada, retrieved29 January 2019:There’s tremendous opportunities at The Bay in order to modify the offering in order to be attractive to a larger segment to the population.[…]Having the Lord & Taylor bannerin their back pocket, they’ve got an extra option there.2010March 4, Sheelah Kolhatkar, “Eliot Spitzer's Mission Impossible”, inTime‎[2], retrieved29 January 2019:Spitzer thinks it's an outrage that the same bankers who brought down the world economy are still firmly in place, bonuses in hand, a government guaranteein their back pocket.2010June 18,Ben Greenman, “King of His Multigenerational Castle?”, inNew York Times‎[3], retrieved29 January 2019:I didn’t mention my son’s remark to my parents because it seemed emotionally manipulative, but I have itin my back pocketjust in case.2015June 4,Sophy Ridge, “Angela Merkelis finally having her feminist moment”, inTelegraph‎[4], UK, retrieved29 January 2019:[S]he bosses around all the blokes in the European Union; has won three elections; and even has a physics degreein her back pocket.

Examples:

EN: It's comforting to have an ace in one's back pocket.
ES: Es reconfortante tener un as en la manga.

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