без сучка без задоринки

Sth. that went off impeccably, smoothly, without any problems.
To do sth. without defects.
Тестирование продукта прошло без сучка без задоринки. — Product testing has been carried out (passed) without any problems (smoothly).
From the carpenters' and cabinetmakers' style of speaking. Initially, about the wood and timber of a high quality and thorough woodworking. Задоринка — roughness, a hook on the surface of a smoothly planed board. Literally — without any defects.
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