(Internet slang) to be hilarious

lupine clover (Trifolium lupinaster)

rare, unusual

sprout, grow / cut one's teeth, teethe

axle, axletree / a very heavy rain, cats and dogs (from the idea of raindrops as big around as a cart's axle) / short for 車軸草 (shajikusō, “clover”)

to rain very heavily, to rain cats and dogs (from the idea of raindrops as big around as a cart's axle)

park

grass / a weed / a herb / a scout, a spy (from the way one would hide in the grass to observe enemy troops) / (figuratively, slang, rare) pubic hair

national park

a forest-park, arboretum