combine, join forces
勠 centers on combining effort or strength: joining forces to work together toward a shared goal.
勠 combines 翏 (which likely contributes the sound) with 力 (strength), suggesting the idea of combining strength or effort.
The left side 翏 looks like feathers (羽) with extra strokes, and the right side 力 is strength. Picture many feathers joining forces to lift a heavy object: combining their strength.
For リク, imagine a team combining forces to pull a rickshaw: rick -> リク, and their joined strength moves it forward.