In French, 'Tout de suite' is a colloquial term used to mean 'right away' or 'immediately'.
Pronunciation and Use
'Tout de suite' is pronounced 'toot sweet' - the phrase is normally said quite quickly, and compresses into two syllables. The distinction between a "d" and "t" is usually neutralised before an "s", hence the confusion. Consequently, 'tout de suite' is often mispelled as 'toute suite.'
'Tout de suite' is widely used in France and is the equivalent of us saying 'come on', 'hurry up', or 'right now' in English.
Other Useful French Terms
Maintenant [man-ten-no(n)] = Now (also pronounced mant-no(n) depending on formality, speed of speech and region. The 'n' at the end of the word is pronounced very softly.)
Bientôt [bee-en-toe] = Soon
Translation Dictionaries and Phrasebooks
French phrasebooks can be quite helpful if you're looking to learn French as it's actually spoken; they often include a pronunciation guide, and things are less likely to get lost in translation. English-to-French and French-to-English dictionaries can also be useful, but it's important to remember that some things do not translate word-for-word.