TDN.84:10 :ܢܬܟܫܦ ܐܝܟܢܐ ܕܡܪܝܐ ܢܫ݁ܝܢ ܠܢ ܒܪ̈ܚܡܘܗܝ‏ : let us plea that the Lord grant us peace through his mercy
See the entire entry for šyn vb. D to make peace