Geron 17.1:2 :ܘܗܝܕܢ ܡܢܢ ܕܡܡܟ ܐܝܠܢܐ ܥܡܗ ܟܕ ܗܘ ܩܥܕ ܒܨܠܘܬܝܗ‏ : whichever of us who can lower the tree when he kneels down in his prayer
See the entire entry for mkk vb. to be low, humble