Deep in thought and Up here

Deep in thought adjective - Deeply absorbed in thought.

Up here and deep in thought are semantically related In some cases you can replace phrase "Up here" with "Deep in thought", this phrases are similar.

Up here adverb - In a specified area or place.

Deep in thought and up here are semantically related in being completely occupied mentally topic. Sometimes you can use "Deep in thought" instead an adjective phrase "Up here".