Where is the entry for "irse"?

I would have given this iPhone app 5 stars, as it is what the previous reviewer states. It is easy to use, seems to be comprehensive in its coverage and the conjugation feature is very useful for someone learning a language. This app is so much handier than flipping through pages of a dictionary. My only complaint so far is that a search for the word "irse" does not come up with anything. Although the word and definition can be found under "ir", way down the page, if one wasnt familiar with the word, it cant be found in the dictionary using the search function. Odd, because when you type in the word, it shows up in the "suggestion" menu, but when you click on the word, it does not take you to a definition. Clearly, an error.

There might be other errors as well. This is just the first Ive run accross.

Sin irse about Collins Spanish-English, v1.4.1