OET interlinear PSA 18:36

uW Translation Notes:

Note 1 topic: figures-of-speech / metonymy

תַּרְחִ֣יב צַעֲדִ֣⁠י תַחְתָּ֑⁠י

(Some words not found in UHB: and,you_have_given to=me shield_of your_salvation_of,your and,your_right_of,hand it,supports_me and,humility_of,your you,make_me_great )

Here David’s step represents the place where he would step. If it would be helpful in your language, you could use an equivalent expression or plain language. Alternate translation: [You enlarge the place where I step under me]

Note 2 topic: figures-of-speech / metaphor

תַּרְחִ֣יב צַעֲדִ֣⁠י תַחְתָּ֑⁠י

(Some words not found in UHB: and,you_have_given to=me shield_of your_salvation_of,your and,your_right_of,hand it,supports_me and,humility_of,your you,make_me_great )

David is speaking as if God had made the area where he needed to walk more spacious. This represents having freedom to move and act without being constrained by enemies. Your language may have a comparable expression that you can use in your translation. You could also use plain language. Alternate translation: [You give me room to maneuver]