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Pinocytosis

Uptake of fluid into a cell via vesicles from the plasma membrane.

"Cell drinking"; uptake of extracellular fluid and small solutes in small vesicles, providing constitutive sampling of the extracellular environment.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
"Cell drinking"; uptake of extracellular fluid and small solutes in small vesicles, providing constitutive sampling of the extracellular environment.

Endocytosis, Phagocytosis