GregNysLR.206.10 :ܘܕܐܝܟܢܐ ܒܙܒܢ ܠܬܚܬ ܡܬܬܚܬܝܢ܃ ܘܒܙܒܢ ܬܘܒ ܠܥܠ ܡܬܥܠܝܢ‏ : how (heavenly bodies) sometimes descend and sometimes go back up
See the entire entry for nḥt vb. to descend