Collocation sounds are produced by a series of two or more words that do not look they naturally belong together, but to native English speakers sound just right. Non-native speakers often have difficulty with this series of sounds because they go against the grain. The phrases that these sounds are found often do not translate well to other languages. The mechanics of English really go sideways with these word choices. This is where online language translators often get tripped up. Collocation sounds are often regionally in nature. Depending on where you are located some people may refer to eating a snack as having a nibble or going out for a bite.
Learning how to properly use and understand collocations will make your speech sound much more natural in the places you are using them. They will also give you a richer vocabulary and means to express your thoughts. This can often lead to your words having a larger impact on your intended audience. One of the best ways to learn these is to read as much as possible. In most cases collocation reside in two different parts of speech that are chunked together.