This is the 13512th most frequent German word.
bloss
"Bloss" means "barely," "merely," "just," or "only" in English.
Here, 'bloß' is used colloquially to emphasize the speaker's concern or surprise about the situation.
Was ist bloß mit ihm los?
What is wrong with him?
The word 'bloß' is employed to indicate a restricted desire, in this case emphasizing the simplicity of the speaker's wish.
Ich möchte bloß die Wahrheit wissen.
I just want to know the truth.
In this sentence, 'bloß' adds urgency and emphasis to the command given by the speaker.