Definition, synonyms and related words
plural of mushroom
"The damp basement was filled with small mushrooms growing on the wood."
Third-person singular simple present indicative form of mushroom
"The fungus spreads rapidly across the damp log in the forest."
In plain English: To mushroom means to grow very quickly and become much larger than before.
"The sun shone through the canopy and mushrooms were growing quickly after last night's rain."