noun:

• point of spear; spearhead ➜ 鋒先【ほさき】
• brunt; aim of attack; force of argument

noun:

• fuse; pilot light
• cause (of a war, argument, revolt, etc.); origin; trigger

noun / ~する noun:

• racing (an engine); idling (an engine) ➜ 空回り
• going in circles (esp. argument, discussion, etc.); spinning one's wheels

noun / ~する noun:

• (providing) covering fire - four character idiom
• supporting (backing up) someone (in a debate or argument)

ichidan verb / transitive:

• to hold down; to twist someone's arm
• to force (someone) to yield (e.g. an argument); to make (someone) surrender

noun / ~の noun:

• side road; byroad
• digression (e.g. from argument)

noun:

• brief remark; few words
• one side (e.g. of an argument); ex-parte statement

noun:

• reason; logic
• method; system; order; thread (e.g. of an argument)

noun:

• cause; factor
• hetu (direct cause, esp. as opposed to indirect conditions) - Buddhism term ➜ 縁【えん】
• the basis of one's argument (in hetuvidya) ➜ 因明

godan ~う verb / transitive:

• to deal with (a person); to treat; to handle; to take care of; to entertain
• to deal with (a problem); to handle; to manage
• to operate (e.g. a machine); to handle; to work
• to deal in; to sell
• to cover (a topic); to treat; to discuss; to take up
• to treat A as B - as ＡをＢとして扱う
• to mediate (an argument) - archaism
• to be too much for one; to find unmanageable - archaism
• to gossip - archaism

noun / ~する noun:

• formation; establishment; materialization; coming into existence
• conclusion (e.g. of a deal); approval; completion; arrangement
• being valid (of a theory, argument, etc.); holding; applying

noun:

• pulse
• vein
• chain (of mountains, etc.)
• hope
• thread (of an argument)