no strings

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no strings (attached)

if there are no strings attached to an offer or arrangement, there is nothing that is unpleasant or not convenient that you have to accept in order to get the advantage from the offer It's very rare that you get a loan that size with no strings attached. The donation has no strings attached, so the charity is free to use it for whatever purpose it chooses.
See pull strings, pull the strings
See also: string
References in classic literature ?
There was no string, but I frolicked along with my master to the Twenty-third street ferry.