do somebody a/no service

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do (one) a service

To help or aid one. Sharon did me a service by getting that jammed paper out of the printer.
See also: service

do (one) no service

To do something that hinders or is detrimental for one. You do your kids no service by catering to their every whim.
See also: no, service
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

do somebody a/no ˈservice

(formal) do something that is helpful/not helpful to somebody: She was doing herself no service by remaining silent.
See also: no, service, somebody
Farlex Partner Idioms Dictionary © Farlex 2017
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