Struggling for individual games is one thing; experiencing a dip on form following the loss of a key player is something many teams experience. But Arsenal still managed good results following Saliba's injury; it's just that in the crucial games, they were found to be lacking in character. Pressure got to them and they couldn't cope.
It's a description used by many, many other football fans. This thread isn't representative of the wider football fanbase, in any way. Most ofther football fans I know say Arsenal bottled it. Most ARSENAL fans I know (I live in North London, not far from Highbury, so I probably know more actual Arsenal fans than most people on here) say that they bottled it. So actually, it is 'our' description. You're in the minority, not me.
^That's an Arsenal fan btw...