यत्

as प्रत्यय
यत् = य त
connect/join that

as धातु
यतीँ = य त इ चंद्र बिंदी
join tumbi (object) inside/outside/surface
यतँ = य त चंद्र बिंदी
join tumbi inside/outside/surface

धातु अर्थ
at प्रयत्न = प्र + यत् + नङ् = reed connect tumbi pull outside =
निकारोपस्कारयोः= निकार उपस्कार = नि + कृ + घञ् उप+कृ+घञ्