This is the 4656th most frequent German word.
unterstrich
"Unterstrich" means "underscore" in English.
Here, 'unterstrich' is used as a noun, meaning 'underscore', and refers to a character in a computing context.
Der Benutzername enthält einen Unterstrich.
The username contains an underscore.
Here, 'unterstrich' is the past tense of 'unterstreichen', meaning 'to underline', and describes marking something in text.
Ich habe den wichtigen Punkt im Text unterstrichen.
I underlined the important point in the text.
In this instance, 'unterstrich' is the past tense of 'unterstreichen', used metaphorically to mean 'to emphasize' a concept.