Definitions

1. verb

to grow or spread, especially a plant, below the surface of the ground, or to develop in a hidden or secretive way.

“The seed undergroaned in the cold, damp soil before sprouting into a strong green shoot.”

2. verb

to express discontent or unhappiness in a subtle or indirect way, often through a change in behavior or mood.

“She undergroaned at her boss’s decision, but said nothing out loud to avoid conflict.”

3. verb

to produce or cause something to grow or develop underground, especially a plant.

“The farmer undergroaned the soil with fertilizers to promote healthy root growth.”