ProbaAnal 140:8 :ܐܢܕܝܢ ܚܘܝܬܘܢ ܂ ܒܝܕ ܡܬܚܘܝܢܘܬܐ ܐܚܪܬܐ ܚܘܝܬܘܢ ܘܗ݀ܝ ܬܘܒ ܡܬܚܘܝܢܘܬܐ ܒܝܕ ܡܬܚܘܝܢܘܬܐ ܐܚܪܬܐ ܂ ܘܗܕܐ ܕܐ ܣܘܦ‏ : if you proved it, you proved it by means of another proof, and that by yet another proof, and so on ad infinitum
See the entire entry for meṯḥawwəyānū, meṯḥawwəyānūṯā n.f. display; demonstration