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to knead; to thicken into a paste (stirring over a flame)
to polish (a plan, etc.); to refine; to elaborate; to work out
to train; to drill; to exercise
to gloss (silk); to soften; to degum
to tan (leather)
to temper (steel)
to walk in procession; to parade; to march
パン生地をしっかりよく練る必要があります。
You need to knead the bread dough well.
作戦を十分に練ってから試合に臨みました。
I worked out a strategy for the game.
作戦を念入りに練った。
I carefully worked out the strategy.