ᴺS. [G.] ^gwiltha- v. “to air, expose to air” (Category: Air, Ether)
Neo-Sindarin: I think this word can be salvaged as a causative verb ᴺS. gwiltha- of the same meaning, from the later version of its root: ᴹ√WIL which still have derivatives related to “air”, such as N. gwelw “air (as a substance)” (Ety/WIL).
Reference ✧ GL/45 ✧ “to air; expose to air”
|#-tha¹||“verb suffix”||✧ GL/45 (#-tha)|